let a = 'QQ昵称：含若飞<br/>QQ头像：<img src="https://q1.qlogo.cn/g?b=qq&nk=529213315&s=100&t=1547904810"><br/><br/>QQ邮箱：529213315@qq.com'
let imgReg = /(?<=(src="))[^"]*?(?=")/ig
let nameReg = /(?<=昵称：).*?(?=<)/gi
let emailReg = /[1-9][0-9]{4,10}@qq.com$/
let img = a.match(imgReg)
let qq_name = a.match(nameReg)
let email = a.match(emailReg)
console.log(email[0])


